[thirdparty/git.git] / replace-object.h

#ifndef REPLACE_OBJECT_H
#define REPLACE_OBJECT_H

#include "oidmap.h"
#include "repository.h"
#include "object-store.h"

struct replace_object {
	struct oidmap_entry original;
	struct object_id replacement;
};

void prepare_replace_object(struct repository *r);

/*
 * This internal function is only declared here for the benefit of
 * lookup_replace_object().  Please do not call it directly.
 */
const struct object_id *do_lookup_replace_object(struct repository *r,
						 const struct object_id *oid);

/*
 * If object sha1 should be replaced, return the replacement object's
 * name (replaced recursively, if necessary).  The return value is
 * either sha1 or a pointer to a permanently-allocated value.  When
 * object replacement is suppressed, always return sha1.
 *
 * Note: some thread debuggers might point a data race on the
 * replace_map_initialized reading in this function. However, we know there's no
 * problem in the value being updated by one thread right after another one read
 * it here (and it should be written to only once, anyway).
 */
static inline const struct object_id *lookup_replace_object(struct repository *r,
							    const struct object_id *oid)
{
	if (!read_replace_refs ||
	    (r->objects->replace_map_initialized &&
	     r->objects->replace_map->map.tablesize == 0))
		return oid;
	return do_lookup_replace_object(r, oid);
}

#endif /* REPLACE_OBJECT_H */
Commit	Line	Data
	1	#ifndef REPLACE_OBJECT_H
	2	#define REPLACE_OBJECT_H
	3
	4	#include "oidmap.h"
	5	#include "repository.h"
	6	#include "object-store.h"
	7
	8	struct replace_object {
	9	struct oidmap_entry original;
	10	struct object_id replacement;
	11	};
	12
	13	void prepare_replace_object(struct repository *r);
	14
	15	/*
	16	* This internal function is only declared here for the benefit of
	17	* lookup_replace_object(). Please do not call it directly.
	18	*/
	19	const struct object_id do_lookup_replace_object(struct repository r,
	20	const struct object_id *oid);
	21
	22	/*
	23	* If object sha1 should be replaced, return the replacement object's
	24	* name (replaced recursively, if necessary). The return value is
	25	* either sha1 or a pointer to a permanently-allocated value. When
	26	* object replacement is suppressed, always return sha1.
	27	*
	28	* Note: some thread debuggers might point a data race on the
	29	* replace_map_initialized reading in this function. However, we know there's no
	30	* problem in the value being updated by one thread right after another one read
	31	* it here (and it should be written to only once, anyway).
	32	*/
	33	static inline const struct object_id lookup_replace_object(struct repository r,
	34	const struct object_id *oid)
	35	{
	36	if (!read_replace_refs \|\|
	37	(r->objects->replace_map_initialized &&
	38	r->objects->replace_map->map.tablesize == 0))
	39	return oid;
	40	return do_lookup_replace_object(r, oid);
	41	}
	42
	43	#endif /* REPLACE_OBJECT_H */